Sifting machine



Sept. 2, .1930. c. A. GESNEL SIFTING- MACHINE Filed April 25, 1928 4 Sheets-Sheet. 1

Chqrles Alred Gesnel INVE NTOR;

AMJL 4w Ammey.

Sept. 2, 1930. c. A. GESNEL ,6

SIFTING MACHINE Filed April 23, 1923 4 Sheets-Sheet 2 I Attorney.

'Se'p't'. 2, 1930. c. A. GESNEL 1,774,644

SIFTING MACHINE Filed April 23, 1928 4 Sheets-Sheet 3 Charles Nsred Gzsnal INVENTOR;

Sept. 2, 1930. c. A. GESNEL SIFTING MACHINE Filed April 23, 192

4 sneaks-sues; 4

7 WM III r Q (.karlas Alfred (usual INVENTOR;

By p

RA Attzmey Patented Sept. 2, 1930 CHARLES ALFRED GESNEL, 0F BOURG, FRANCE srr'rrne MACHINE f Y Application filedApril 23, 1928, Serial No. 271,998, and in France May 7, 1927.

Sitting machines are known, which comprise blades or vanes which project the material being treated ata certain angle against a screen or mesh, but these prior art machines have no means to permit this angle to be varied without a complete modification of the machine itself. Moreover, in existing machines the blades are all of uniform length so that, in operation, the material under treatment drops to the bottom oi the .machine and is projected only against the lower. perforated surface of the screen.

The objectof the present invention is to obviatethe disadvantages of existing ma chines, and it relates to a sitting machine characterized by the provision of adjusting members arranged. for example, at the ends of the blades. These adjusting members regulatethe direction of projection of the material against the screen, so that bya simple adjustment of the machine without a reconstruction or rearrangement of the parts thereof, the degree of fineness of the sitting action may be changedat will. The blades 5 are also of ditferent lengths, which permits of projecting the material in, different planes against the screen and more regularly distributing the material on the screen; in this manner, the efiiciency of the screen is increased.

The purpose of the invention is to. ensure a cleaning, as uniform as possible, of the sieves, in such a manner that their choking up may be eliminated.

The sifting machine, forming the subject or" the invention, allows these various objects to be attained by means of essential features described in the specification below, and in the claim annexed to that specification.

Thepret'erable embodiment of the inven tion is shown as an example on the drawings appended wherein p Figure 1 is a part elevation and a part vertical axial section of a sitting machine according to the invention.

Figure 2 is a plan of this machine.

F igures 3 and at are two half sections 01? this machine respectively according to the lines 3-3 and ll of Figure 1.

Figure 5 is a half elevation and half longithis third stage.

from the preceding turbine respectiicly to tudinal axial section of the first stage of the turbine.

Figure 6 is a plan view of this first stage. Figure 7 1s a part section of the extremity or a blade.

Figure 8 is a diagram showing the various heights of the blades of this turli ine.

F igure 9 is a developed view of the sitting gauze of the first stage of the turbine.

Figure 10 is asection of this gauze according to the line it), 10 of Figure 9:

F i gure 11 is :1 section on a larger scale oi the vibrator of the sieve.

Figure 12 is a half elevation and a hall longitudinal section of the second stage of the turbine.

Figure 13 is a plan view of the second st 0'- Figure 14 is a sectionoi one of the Hi tors of this second stage.

Figure 15 half elevation and a vertical axial half section 01 the third Figure 16 is a plan of this third stage.

Figure 17 is a section or" the vibrator of Figure 18 is a detail view of one end of a 0 blade or vane.

The apparatus constituting the preferable embodiment of the invention, comprises three stages viz, 1 ,1 1 of turbines on a common vertical shaft 2, above each of which a funnel 3 3 is placed which guides the material in the direction of axis. The top funnel 3 ensures the c" ing, whilst the tunnels lead the i the second and third turbine.

Below the lower turbine a receptacle 7 is provided, which collects the residue oil the upper turbines, it being emptied by the action of the blade 8 (Figure l) through a lateral channel 9. i

The apparatus is encircled by a cylinder 10 which terminates in a discharge funnel 11.

The first turbine 1 consists of the curved M wing-lets or blades el carried on a plate 5 F i gure 3) and it is encircled by a stationary cylindrical sieve gauze 6 The details of this first stage are represented in the Figures It will be particularly'noted in Figure 8 that the blades of the turbine are of three different heights which allows the lormation ol a series ol channels. The n'iaterial to be sifted, having been charged into the upper Tunnel 3 at the top o i the apparatus, reaches the upper turbine l which projects it with force against the curz-cs nun. ,f 2.li.'lt (5,. in

a direction which depends on the inclination oi the blades and on the speed (it rotation, and which can consequently be regulated as desired. The gauze 'tunctions thus, as regards the particles of the material, as it the holes were flattened and the sifting is much liner. in accordance with nrv invention, each blade at carries at its :l'ree end an interchangeable sheet metal adjusting men'iber G0, which may be of dillerent shapes, thus permitting variation of the angle at which the material is projected against the screen and consequent modil'icaiion ot the linencss oi the sitting action to be eliccted, without any need to change the i achine.

lhe materials that pass th ough the gauze cloth 6 ol the first 'turoiue pass to the discharge 'lunnel ll; the residue is passed on to the second turbine 1 this second turbine consists of a series oi' inwardly curved arms l2 which rccii'ivc llnid unde pressure from central boxes 13, which are themselves led by the hollow shalt 14. A tunnel $1) loads the residue ol the lirst turl 'n i to the second one. The material arriving a is pr=.i icctcd towards the 1' mi jec'tcd to the action oi the jets the pipes l2 which project it on the cloth The Formation of lumps oi: latty powder is thus cliniinatcd.

The tluid ennploye il may be, {rounding to the circumstances either air or water.

The residue that has not passed through the uze oi the second turbine l. collected by "the tunnel 3 and reaches the third turbine 1 which is similar to the second turbine 1 except that the pipes are radial. But by the ellect of the rotation, as is well known, the speed 01 the fluid izi-isuing from the said pipes is inclined in relation to the gauze 6.

Each turbine stage 3 3 3 is provided with automatic means oi cleaning; the. sieve gau es 6 G 6".

The first stage 3 for this purpose arranged as follows :vibrators 23 are fixed at various places on a blade oi steel 24-, which is itselt fixed at to the ri... frame or the gauze cloth 6 Each 01: the vibrators consists (Figure 11) of a spring lamination 23 which is connected by means of the rivets 26 to the steel blade This spring lamination 23 is curved at 36 and forms a hook 37 which is the point of contact.

On the other hand a. fork 27; titted to the extremity of each blade 1- and connec ed with it by rivets 30, carries at its extremity a Spindle 31 on which a little roller is placed. with a considerable play j, the diameter of that spindle being much smaller than the bore oi the roller.

Thus the roller 32 sits loose on its spindle, and it is only the centrifugal force that causes its touch action as soon as it encounters the vibrators 23.

During each revolution, the vibrator or vibrators are actuated and tansmit their vibrations to the sieves. It is therefore possible, in employing 2, 3, l or a larger num ber of vibrators per blade, and in running them at speeds of from 800 to 900 revolutions per minute, to obtain from 18UO3600 and more impacts per minute and thus maintain a quick and constant vibration of the sieves; their meshes therefore always remain clear, and the sitting action is conse qucntl certain and the output a maximum.

The second stage 3 of the turbine has an absolutely similar arrai'igement, tor the purpose of ensuring the cleaning of the gauze sieves The vibrator, however, details of which are shown in Figure 1 consists oi a 't at spring l-O riveted at one of the extremities, at ll, on the steel blade 2a, and at the other extremity at 2 on a small rigid lever 4-2" provided with a raised part 44. By pressingfg on this raised part the extremity a2 lilted oil the spring l0 which snaps back into its place, as soon as 44: is released.

The third stage 3 of the turbine has a sim- 'lar arrangen'ient as regards the cleaning of he gauze sieves 6. The vibrator (Figure comprises a lever elT, pivoted or articutcd on the axis 4.8, and under the influence oi a spring d9 with long tree branches 49 if)" which are fixed, one on 24 and the other on the lever 47. In pressing on the extremity 50 of the lever d7, the spring 49 is tensioned whilst the extremity 51 of this lever 47 is lifted; this extremity shoots back into its place as soon as the extremity 50 of the lever 47 is released.

Claim:

In a sitting machine, the combination of a. sieve, means to project the material being; treated at a certain angle against said sieve, inti'ircaangcable means to vary said angle at will, means to receive the particles which have traversed the sieve and means to receive the residue of the material which has not traversed the sieve.

In testimony whereof I atlix my signature.

CHARLES ALFRED GESNEL. 

